Det-Tronics R8471NH34001,2,3 Single Channel Gas Controller, NH3 - Manual (Page 18)

95-8529 1.1 16
Section III
System Startup
STARTUP PROCEDURE
1. Output loads that are controlled by the system
should be secured (remove power from all output
devices) to prevent actuation.
2. Check all external wiring. Be sure that the sensor
has been wired properly.
3. Before installing the controller in the mounting rack,
inspect it to verify that it has not been physically
damaged in shipment. Check the jumper plugs
and rocker switches on the controller for proper
programming, then slide the controller fully into the
mounting rack.
4. Apply power to the system.
NOTE
When power is applied to the system, the
controller enters a time delay mode before
beginning normal operation. During this time
the outputs are inhibited, the FAULT LED is
illuminated, and the current output indicates a
fault condition. This delay allows time for the
sensor output to stabilize before normal operation
is begun. The controller will remain in the time
delay mode up to five minutes or until the sensor
output is within normal range (no fault or alarm
conditions exist). At the end of the time delay,
the controller automatically enters the Normal
operating mode.
5. Put the controller in the Setpoint Display mode
to determine the present alarm setpoints and
calibration gas time. If changes are required,
perform the Setpoint Adjustment procedure.
6. Perform the calibration procedure.
7. Check the 4 to 20 ma current loop for proper
calibration and adjust as required.
8. Remove mechanical blocking devices (if used) and
restore power to the output loads.
SETPOINT ADJUSTMENT
To check the present levels, use the “Setpoint Display
Mode” described below. To change the values, use
the “Setpoint Adjustment Procedure.”
NOTE
In the Setpoint Display or Setpoint Adjust mode,
a flashing alarm LED identifies the particular
setpoint currently being indicated on the digital
display. A flashing CAL LED indicates that the
programmed calibration gas time is currently
being shown on the digital display.
SETPOINT DISPLAY MODE
NOTE
In the Setpoint Display and Setpoint Adjust
modes, the digital display indicates the
calibration gas time in increments of 16 seconds.
To determine the total calibration gas time
indicated by the display, the reading indicated
on the display must be multiplied by 16 seconds.
To determine the number that should be used
for programming the controller for the correct
calibration time, determine the desired calibration
time in minutes (five minutes is recommended),
then multiply by 60 seconds, then divide by 16.
For example, to program the controller for a
calibration time of five minutes:
5 minutes X 60 seconds = 300 seconds
300 seconds ÷ 16 seconds = 18.75 units
Programming the controller for a reading of “19”
produces a calibration time of five minutes and
four seconds.
1. To enter the Setpoint Display mode, press and hold
the Reset button until the Low LED begins to blink
(approximately one second). Release the Reset
button. The low alarm setpoint will be shown for two
seconds on the digital display.
NOTE
The Reset button should be released as soon
as the controller has entered the Setpoint
Display mode (after one second). If the button
is still depressed at the end of the Setpoint
Display mode (9 seconds), the controller will
automatically enter the Calibrate mode. If the
operator is not prepared to perform a calibration,
a calibration fault will occur. Recycle power to
the controller to exit the calibrate mode without
affecting the calibration settings.